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International Conference on High Voltage engineering and Application

作者： Georgios D. Peppas Aristeidis P. Bakandritsos Eleftheria C. Pyrgioti Roula Kripotou Apostolos Kyritsis Ioannis F. Gonos Electrical and Computer Engineering University of Patras Department of Physical Chemistry and Experimental Physics Faculty of Science Regional Centre of Advanced Technologies and Materials Palacky University School of Applied Mathematical and Physical Sciences National Technical University of Athens School of Electrical and Computer Engineering National Technical University of Athens

ISBN: (纸本)9781509004973

In this paper a detailed study of two types of nanofluids is performed by means of AC breakdown voltage tests (IEC 60156) and Dielectric Relaxation Spectroscopy. The first under tested nanofluid (pNF) is composed from natural ester oil matrix and purchased nanoparticles (Aldrich) ensuant to surface modification coating. Accordingly, the second nanofluid (colNF) aparted from colloidal hydrophobic self-assembled nanoparticles with in-situ surface coating technique, inserted adequately into natural ester oil matrix. The aforementioned nanofluids (pNFcolNF) are studied under AC breakdown voltage wherein an interesting increase of the dielectric strength is demonstrated. Accordingly the dielectric response of the aforesaid nanofluids has been investigated by employing dielectric measurements, wherein the nanofluid's dielectric permittivity is studied isothermally, as a function of frequency in the range of 10~(-1) to 10~6 Hz at temperatures from 20-100 ℃ under dry nitrogen atmosphere. Finally a thermal response study is performed, wherein the response of the nanofluids is compared with the natural ester oil matrix.

关键词： Nanofluid Dielectric relaxation spectroscopy Colloidal nanoparticles AC breakdown voltage Dielectric liquids

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Long-range transport of 2D excitons in dynamic acoustic lattice

Research Square

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Research Square 2021年

作者： Peng, Ruoming Ripin, Adina Ye, Yusen Zhu, Jiayi Wu, Changming Lee, Seokhyeong Li, Huan Taniguchi, Takashi Watanabe, Kenji Cao, Ting Xu, Xiaodong Li, Mo Department of Electrical and Computer Engineering University of Washington SeattleWA98195 United States Department of Physics University of Washington SeattleWA98195 United States Department of Material Science and Engineering University of Washington SeattleWA98195 United States Research Center for Functional Materials National Institute for Materials Science Tsukuba Japan

Excitons are elementary optical excitation in semiconductors. The ability to manipulate and transport these quasiparticles would enable excitonic circuits and devices for quantum photonic technologies. Recently, interlayer excitons in 2D semiconductors have emerged as a promising candidate for engineering excitonic devices due to long lifetime, large exciton binding energy, and gate tunability. However, the charge-neutral nature of the excitons leads to a weak response to the in-plane electric field and thus inhibits transport beyond the diffusion length. Here, we demonstrate the directional transport of interlayer excitons in bilayer WSe2 driven by the dynamic potential lattice induced by surface acoustic waves (SAW). We show that at 100 K, the SAW-driven excitonic transport is activated above a threshold acoustic power and reaches a distance at least ten times longer than the diffusion length, only limited by the device size. Temperature-dependent measurement reveals the transition from the diffusion-limited regime at low temperature to an acoustic field-driven regime at elevated temperature. Our work shows that acoustic waves are an effective, contact-free means to control exciton dynamics and transport, promising for realizing 2D materials-based excitonic devices such as exciton transistors, switches, and transducers. © 2021, CC BY.

关键词： Excitons

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Digital Technology in Health Education Trend Mapping through Bibliometrics Analysis

Digital Technology in Health Education Trend Mapping through...

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International Conference on Informatics, Multimedia, Cyber and Information System (ICIMCIS)

作者： Fairuz Iqbal Maulana Dian Lestari Vandha Pradwiyasma Widartha Nirwana Haidar Wahyu Dirgantara Computer Science Department School of Computer Science Bina Nusantara University Jakarta Indonesia Faculty of Medicine Airlangga University Surabaya Indonesia Information System of Industrial Engineering Faculty Telkom University Bandung Indonesia Informatics Engineering Study Program University of Madura Pamekasan Indonesia Department of Electrical Engineering University of Merdeka Malang Malang Indonesia

ISBN: (纸本)9781665473286

This study examines the mapping of research data on digital technology in the field of health education using bibliometric analysis method. Data was collected by identifying keywords in the Scopus database and sorting them out to sort the studies from the last 10 years (2012–2021). Through this step, a total of 1482 documents were obtained (articles, journals, proceedings, books, and others). The data is then processed using the VOSViewer instrument to obtain a visualization of the mapping analysis. This study also analyzes the network types of authors and co-authors through the VOSViewer instrument. The result of this study indicates that the most document types published within ten years are Articles (66.5%), Review (22.9 % ), Conference Paper (4.2 % ), and others. The most studied subjects are Medicine (55.7%), Nursing (9.0%), Health Professions (8.2%), Social sciences (7.8%), engineering (3.9%), computer science (2.6 % ), Environmental science (2.6 % ), Biochemistry-Genetics and Molecular Biology (2.2%), Psychology (1.6%), and Dentistry (1.3%). This study offers a written communication process and the nature and direction of developing descriptive means of counting and analyzing the various phases of communication as well as recognizing the authorship and direction of its symptoms in documents on the subject of digital technology in the health sector.

关键词： Training Pediatrics Instruments Education Bibliometrics Transportation Psychology

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Demonstration of a polarization-agnostic geometric phase in nonlocal metasurfaces

Demonstration of a polarization-agnostic geometric phase in ...

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2023 Conference on Lasers and Electro-Optics, CLEO 2023

作者： Overvig, Adam C. Kasahara, Y. Alu, Andrea Photonics Initiative Advanced Science Research Center City University of New York New YorkNY10031 United States Department of Electrical and Computer Engineering The University of Texas at Austin AustinTX78712 United States Physics Program Graduate Center of the City University of New York New YorkNY10016 United States

We theoretically propose and experimentally demonstrate nonlocal metasurfaces rationally designed using symmetry-breaking principles to manipulate the optical wavefront with a geometric phase selective to custom ellip...

ISBN: (纸本)9781957171258

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Millimeter Wave Imaging of Corrosion Under Paint: Comparison of Two Probes

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AIP Conference Proceedings 2006年第1期820卷 447-454页

作者： M. Ghasr S. Kharkovsky R. Zoughi M. O’Keefe A. Padwal D. Palmer 1Applied Microwave Nondestructive Testing Laboratory (amntl) Electrical and Computer Engineering Department University of Missouri‐Rolla Rolla MO 65409 2Materials Science and Engineering Department Graduate Center for Materials Research University of Missouri‐Rolla Rolla MO 65409 3The Boeing Company Phantom Works St. Louis MO 63166

Critical aircraft structures are susceptible to harsh environmental conditions that cause corrosion of these structural components. It is of great importance to detect corrosion under paint, particularly in its early stages. Millimeter wave nondestructive evaluation methods have shown great potential for detecting corrosion under paint and evaluating its properties. This paper presents and compares the results of using two distinct millimeter wave detection methods; namely a standard single probe and a newly developed differential probe for detecting corrosion under paint.

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In tegration of carbon nanostructures on CMOS for lab-on-a-chip sensing

In tegration of carbon nanostructures on CMOS for lab-on-a-c...

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International Symposium on Circuits and Systems

作者： Khandaker A. Al Mamun Jinlong Gu Dale K. Hensley Syed K. Islam Nicole McFarlane Department of Electrical Engineering and Computer Science The University of Tennessee Knoxville TN USA Center for Nanophase Materials Sciences Oak Ridge National Laboratory Oak Ridge TN USA

ISBN: (纸本)9781479953424

We review the challenges and suggest future directions of carbon nanostructure CMOS integration for lab-on-a-chip systems. Power and area requirements of standard benchtop sensor instrumentation limits their use in portable applications. We have been developing carbon based nanostructures and low power analog readouts to enable sensitive and highly efficient sensor measurement in a single measurement platform. Specifically, we review integration methods for carbon nanofibers and nanospikes with sensor readouts on a CMOS platform. These lab-on-chip systems offer high throughput, require low operating power and allow complete system implementation in portable and implantable devices.

关键词： CMOS integrated circuits Nanostructures Silicon Carbon Nanobioscience Wires Sensors

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Sentiment Analysis of Hashtag Activism on Social Media Twitter

Sentiment Analysis of Hashtag Activism on Social Media Twitt...

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computer science, Information Technology and engineering (ICCoSITE), International Conference on

作者： Sidharta Sidharta Yaya Heryadi Lukas Lukas Wayan Suparta Yulyani Arifin Computer Science Department BINUS Graduated Program Computer Science Bina Nusantara University Jakarta Indonesia Cognitive Engineering Research Group (CERG) Universitas Katolik Indonesia Atma Jaya Jakarta Indonesia Department of Electrical Engineering Faculty of Industrial Technology Institut Teknologi Nasional Yogyakarta Yogyakarta Indonesia

Currently, the performance of the police in Indonesia is often in the spotlight of the public with cases that occur, both on a national and regional scale, including personal experiences who also feel disappointed with the performance of the police. The cases, such as the rape of three children by a biological father in East Luwu, and the barrage of other cases that have occurred, in their handling have left the public disappointed, giving rise to the hashtag percumlaporpolisi on social media, especially on twitter. This hashtag became trending and was widely responded to by the public. Using free hashtag keywords, tweet data is collected using Twitter’s API for sentiment analysis. The datasets obtained from the crawling results is the latest data with a total of 100 datasets. This study applies the naïve bayes algorithm using textblob which aims to determine the value of polarity and subjectivity. From the results of the analysis carried out, the words that appear most often are useless police, police chief, and policeman. While the results of the sentiment analysis that has been carried out are 40 percent positive sentiment, 40 percent are neutral sentiment and 10 percent are negative sentiment from the hashtags used. From these results, according to the keywords used, the percentage of negative sentiment should be greater than positive and neutral sentiment. It is necessary to conduct a more in-depth study related to the model used in the next research.

关键词： computer science Sentiment analysis Pediatrics Law enforcement Social networking (online) Blogs Biology

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Electron–soft phonon scattering in n-type SrTiO3

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Physical Review B 2016年第19期94卷 195122-195122页

作者： W. X. Zhou J. Zhou C. J. Li S. W. Zeng Z. Huang H. J. Harsan Ma K. Han Z. S. Lim D. Y. Wan L. C. Zhang T. Venkatesan Y. P. Feng Ariando NUSNNI-NanoCore National University of Singapore Singapore 117411 Department of Physics National University of Singapore Singapore 117542 Department of Materials Science and Engineering National University of Singapore Singapore 117575 NUS Graduate School for Integrative Sciences and Engineering National University of Singapore Singapore 117456 Department of Electrical and Computer Engineering National University of Singapore Singapore 117576

SrTiO3 undergoes a cubic to tetragonal phase transition at Tc=105–110K, which can be described by a Brillouin zone corner Γ25 (111) soft phonon. Even though clear anomalies in specific heat, thermal expansion coefficient, and sound velocity have been observed, the correlation between phase transition and electronic transport properties in n-type doped SrTiO3 is still controversial. Here, we report phase transition induced electronic transport anomaly in temperature dependence of the temperature coefficient of resistance (TCR) consistently observed in a wide variety of SrTiO3-based systems by detailed transport measurements and first-principles calculations. The observed TCR anomaly, which can be well fitted with the electron–Γ25 soft phonon scattering around Tc, is found to be caused by anomalies in both mobility and carrier density, with the former taking the dominant role. Moreover, the magnitude of the anomaly is found to decrease with increasing carrier density. These findings demonstrate the role of the electron–Γ25 soft phonon scattering in the conduction mechanism in SrTiO3-based systems.

关键词： electrical conductivity Electron-phonon coupling Phase transitions Oxides Perovskites Density functional calculations

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Thermal conductivity of polymers and polymer nanocomposites

arXiv

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arXiv 2018年

作者： Huang, Congliang Qian, Xin Yang, Ronggui School of Electrical and Power Engineering China University of Mining and Technology Xuzhou221116 China Department of Mechanical Engineering University of Colorado BoulderCO80309 United States Materials Science and Engineering Program University of Colorado BoulderCO80309 United States

Polymers are widely used in industry and in our daily life because of their diverse functionality, light weight, low cost and excellent chemical stability. However, on some applications such as heat exchangers and electronic packaging, the low thermal conductivity of polymers is one of the major technological barriers. Enhancing the thermal conductivity of polymers is important for these applications and has become a very active research topic over the past two decades. In this review article, we aim to: 1). systematically summarize the molecular level understanding on the thermal transport mechanisms in polymers in terms of polymer morphology, chain structure and inter-chain coupling;2). highlight the rationales in the recent efforts in enhancing the thermal conductivity of nanostructured polymers and polymer nanocomposites. Finally, we outline the main advances, challenges and outlooks for highly thermal-conductive polymer and polymer nanocomposites. Copyright © 2018, The Authors. All rights reserved.

关键词： Nanocomposites

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High-temperature characterization of SiCN ceramics for wireless passive sensing applications up to 500°C

High-temperature characterization of SiCN ceramics for wirel...

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IEEE Annual Conference on Wireless and Microwave Technology (WAMICON)

作者： Xinhua Ren Siamak Ebadi Yaohan Chen Linan An Xun Gong Department of Electrical Engineering and Computer Science University of Central Florida Orlando FL USA Advanced Materials Processing and Analysis Center University of Central Florida Orlando FL USA

A novel technique is presented in this paper to precisely characterize silicon carbonitride (SiCN) ceramic materials at high temperatures for wireless passive sensing applications. This technique is based on a high quality (Q) factor resonator method, which allows accurate characterization of both dielectric constant and loss tangent. SiCN ceramic materials are measured from 50°C up to 500°C. It is observed that the dielectric constant of SiCN increases from 3.71 to 3.87, corresponding to a temperature range between 50 and 500°C. This temperature-dependent dielectric constant behavior provides the basis for the development of wireless passive temperature sensors in high-temperature applications.

关键词： Dielectric measurements Temperature measurement Dielectrics Coplanar waveguides Polymers Temperature sensors

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